US5347915A - Piston compressor for the oilfree compression of gases - Google Patents

Piston compressor for the oilfree compression of gases Download PDF

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Publication number
US5347915A
US5347915A US07/954,443 US95444392A US5347915A US 5347915 A US5347915 A US 5347915A US 95444392 A US95444392 A US 95444392A US 5347915 A US5347915 A US 5347915A
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US
United States
Prior art keywords
ring
piston
circumferential face
piston ring
face
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/954,443
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English (en)
Inventor
Norbert Feistel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Burckhardt Compression AG
Original Assignee
Maschinenfabrik Sulzer Burckhardt AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maschinenfabrik Sulzer Burckhardt AG filed Critical Maschinenfabrik Sulzer Burckhardt AG
Assigned to MASCHINENFABRIK SULZER-BURCKHARDT AG reassignment MASCHINENFABRIK SULZER-BURCKHARDT AG ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FEISTEL, NORBERT
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/08—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction with expansion obtained by pressure of the medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/20—Rings with special cross-section; Oil-scraping rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/28—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction of non-metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/04—PTFE [PolyTetraFluorEthylene]

Definitions

  • Each trapped piston ring has a collar projecting in the axial direction, either only from the side next the compression space so that in cross-section the piston ring has an angular profile, or from both sides of the ring in the axial direction so that a T-shaped cross-section results.
  • the projecting collar is behind a shoulder projecting axially from the annular groove, this shoulder forming a stop for the piston ring when it widens under the pressure from the gas acting on its inner circumferential face. Because of this expansion limitation the piston rings are called trapped rings.
  • the piston ring is not yet lying with its collar against the shoulder of the annular groove but its outer circumferential area slides against the inner face of the cylinder.
  • the piston ring has a high rate of wear and there is little leakage of gas.
  • the problem underlying the invention is to improve the piston compressor of the kind under consideration, in such a way that the operational behavior of the trapped piston ring is optimized and the structural form of the piston ring is simplified to reduce its production costs.
  • This problem is solved in accordance with the invention by forming a wedged face with an angle of from 5° to 15° beginning at the circumferential face next to the inner face of the cylinder.
  • the wedged face ends where it intersects with a residual area of the piston ring next the compression space.
  • the face of the ring groove in the piston adjacent to the wedge face has the same angle as and is parallel with the wedge face.
  • German patent 31 48 488 discloses a trapped piston ring in which at the transition to the projecting collar an obtuse rather than a right angle is provided, for reducing the notch effect at the point of transition.
  • a clamping action of the piston ring in its stop position against the projecting shoulder of the annular groove is neither intended nor possible.
  • the part of the piston ring extending from the projecting collar towards the inner face of the cylinder is conventionally bounded by two radial parallel areas. Thus here too a fluttering of the piston ring is not prevented.
  • the new structural form of the piston ring is particularly advantageous if according to a further development of the invention the piston ring is made of a plastic material having a good dry running property. In this case at high temperatures and gas pressures an extrusion effect known in itself but otherwise undesirable can occur, which consists in the piston ring being deformed in the radial direction. In the case of the piston ring in accordance with the invention the sealing function is hereby improved without the operational safety becoming impaired.
  • FIG. 1 is a simplified axial section through the piston and the cylinder of a piston compressor constructed according to the invention
  • FIG. 2a is an enlarged detail, in section, of the area in FIG. 1 designated "A" in a first operational phase;
  • FIG. 2b is a detail similar to FIG. 2a in a second operational phase
  • FIGS. 3a and 3b are views corresponding to FIGS. 2a and 2b and illustrate a modified piston ring
  • FIGS. 4a and 4b are views corresponding to FIGS. 2a and 2b of a further modified piston ring.
  • the piston compressor has a cylinder 1 in which a piston 2 is arranged to be movable up and down.
  • the end of the piston at the bottom of FIG. 1 continues into a piston rod 3 which is conventionally connected to a crankshaft (not shown).
  • a compression space 4 into which, during the downwards stroke of the piston 2, the gas which is to be compressed is sucked. During the succeeding upwards stroke it is compressed and ejected from the compression space.
  • the piston 2 consists of a rodlike extension 5 from the piston rod 3 surrounded by a sleeve 6 which carries seven trapped piston rings 10 arranged one above the other.
  • the piston rings 10 are held together by a nut 7 screwed onto the upper end of the extension 5.
  • the split piston ring 10 is disposed in a ring groove 30 defined by first and second chamber rings 20, 21 and has a cylindrical inner circumferential face 12 remote from the inner face 11 of the cylinder 1.
  • the boundary area 13 of the piston ring at the bottom of FIG. 2a is at a right angle to the inner circumferential face 12 and rests for the greater part against a plane guide face 30 of a chamber ring 20.
  • the piston ring has at its other end a boundary area 14 which extends over only part of the radial width of the piston ring 10 and rests against a plane guide face 32 of an annular segment 33 of a second chamber ring 21.
  • annular space 23 Between the inner circumferential face 12 and a cylindrical boundary area 22 on the chamber ring 21 is an annular space 23 which opens via a channel 24 into an annular space 25 between the cylinder 1 and the chamber ring 21. In this way the annular space 23 is subject to the gas pressure in the annular space 25 and presses the outer circumferential face 15 of the piston ring against the inner face 11 of cylinder 1.
  • an area 16 which is formed as a wedge face.
  • the opposite wedge face 34 in the chamber ring 21 adjacent to the wedge face 16 is inclined at the same angle ⁇ but the guide face 32 in the chamber ring for the boundary area 14 is radially outwardly offset relative to boundary area 14 by an amount X.
  • This means that the piston ring 10 can shift outwards in the annular groove formed by the chamber rings 20 and 21 by the amount X as its thickness decreases because of frictional wear against the inner face 11. This state is shown in FIG. 2b.
  • the piston ring 10 rests with its wedge face 16 against the opposite wedge face 34 of the chamber ring 21 and hence is impeded from further expansion in the radical direction. Consequently the piston ring is a trapped piston ring. Further wear at the outer circumferential face 15 is only possible if the piston moves radially as it reciprocates in the axial direction. In such a case a narrow annular gap can form between the inner face 11 of the cylinder and the outer circumferential face 15 of the piston ring past which some leaking gas escapes into the next annular space 25' as seen in the direction of the crankshaft. In this case the piston compressor works like one with labyrinth sealing rings.
  • the residual area 16' of the piston ring remote from the compression space is also formed as a wedge face.
  • the area in the chamber ring 20' adjacent to this second wedge face 16' is corresponding wedge-shaped.
  • the chamber rings 20' and 21' are subdivided in the plane of the boundary area 14.
  • This embodiment is intended for compressors in which the piston compresses in two stages, i.e., the piston and the piston rod are made so that there is a compression space at the end of the piston 2 at the bottom in FIG. 1 as well.
  • the arrangement of FIGS. 3a and 3b functions in the same way as has been described in connection with FIGS. 2a and 2b.
  • the piston ring 10 consists of two materials of different heat resistance.
  • the part 10' with the cross-section of the piston ring which is remote from the inner face 11 of the cylinder and the part 10" remote from the compression space form an L-shaped profile which exhibits a higher heat resistance but a less good dry running property than the remaining cross-section of the ring for which a good dry running property is important. In this way the softer part of the piston ring may be supported by the L profile.
  • the chamber rings 20 and 21 are again made as described with respect to FIGS. 2a and 2b. The method of operation is also the same as described with respect to those Figures.
  • the embodiment shown in FIGS. 4a and 4b is used for compressors with extreme combinations of pressure and temperature.
  • piston rings are described for a piston compressor of crosshead construction; they may also be employed with compressors having plunger piston construction.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compressor (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US07/954,443 1991-11-06 1992-09-30 Piston compressor for the oilfree compression of gases Expired - Lifetime US5347915A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH03237/91-5 1991-11-06
CH323791 1991-11-06

Publications (1)

Publication Number Publication Date
US5347915A true US5347915A (en) 1994-09-20

Family

ID=4251620

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/954,443 Expired - Lifetime US5347915A (en) 1991-11-06 1992-09-30 Piston compressor for the oilfree compression of gases

Country Status (11)

Country Link
US (1) US5347915A (de)
EP (1) EP0541482B1 (de)
JP (1) JP3285624B2 (de)
AT (1) ATE120521T1 (de)
AU (1) AU650798B2 (de)
BR (1) BR9204299A (de)
CA (1) CA2082205C (de)
CZ (1) CZ289846B6 (de)
DE (1) DE59201774D1 (de)
ES (1) ES2070618T3 (de)
PL (1) PL169681B1 (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040216606A1 (en) * 2003-03-21 2004-11-04 Smith Thomas J. Piston ring coating
US20050051970A1 (en) * 2003-09-10 2005-03-10 Wolfgang Edelmann Piston ring
WO2005121608A1 (en) * 2004-06-08 2005-12-22 Savice Limited A piston, a ring and a piston assembly for a two cycle engine
CN1312419C (zh) * 2001-07-09 2007-04-25 伯克哈特压缩机股份公司 活塞环
US20070241297A1 (en) * 2006-04-13 2007-10-18 Honeywell International, Inc. Guided pneumatic second stage switching valve
US7455506B2 (en) * 2004-12-29 2008-11-25 Bendix Commercial Vehicle Systems Llc Injection moldable piston rings
US20130154197A1 (en) * 2010-08-31 2013-06-20 Norbert Feistel Seal arrangement
US20130233259A1 (en) * 2010-09-23 2013-09-12 Michael W. Courson Rotary cam radial steam engine
US9138839B2 (en) 2009-12-14 2015-09-22 Hoerbiger Kompressortechnik Holding Gmbh Piston having position rings and support rings
DE102014114924A1 (de) * 2014-10-14 2016-04-14 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Kolben-Zylinder-Anordnung für einen ölfreien Verdichter zur Erzeugung von Druckluft
US9856866B2 (en) 2011-01-28 2018-01-02 Wabtec Holding Corp. Oil-free air compressor for rail vehicles
EP4227533A1 (de) * 2022-02-10 2023-08-16 Burckhardt Compression AG Kolben für einen verdichter, verdichter sowie verfahren und abziehwerkzeug zur demontage eines kolbens
CN118328907A (zh) * 2024-06-14 2024-07-12 江苏省计量科学研究院(江苏省能源计量数据中心) 一种梯形活塞环梯形角的分段式测量系统及方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997019280A1 (de) * 1995-11-17 1997-05-29 Maschinenfabrik Sulzer-Burckhardt Ag Kolbenring
AT507055B1 (de) 2009-01-22 2010-08-15 Hoerbiger Kompressortech Hold Kolben mit kolbenringen und stützringen
FR3009037B1 (fr) * 2013-07-23 2016-01-29 Vianney Rabhi Dispositif d'etancheite pour piston

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB284133A (en) * 1927-06-11 1928-01-26 William James Banks Improvements in metallic packing rings for pistons
US1779837A (en) * 1927-08-30 1930-10-28 Joseph F Batty Ring packing
US2294519A (en) * 1941-08-09 1942-09-01 Caterpillar Tractor Co Piston structure
CH232422A (de) * 1942-07-23 1944-05-31 Limited M E P Company Dichtungsring-Lagerung.
DE884586C (de) * 1943-06-29 1953-07-27 Maschf Augsburg Nuernberg Ag OElabstreifvorrichtung an Kolben von Brennkraftmaschinen
US2799523A (en) * 1954-05-06 1957-07-16 Linear Inc Pressure-actuated seals
US2948554A (en) * 1957-07-29 1960-08-09 Mahand Jack Rotary seal
US3023014A (en) * 1957-11-18 1962-02-27 Int Harvester Co Seal between relatively rotating members
US3353832A (en) * 1965-05-24 1967-11-21 Felt Products Mfg Co Sealing assembly
GB1357090A (en) * 1973-03-14 1974-06-19 Foerenade Fabriksverken Sealing devices for limiting fluid leakages along piston rods or other elongated cylindrical elements
DE2361425A1 (de) * 1972-12-19 1974-06-20 Rudisleben Chemieanlagenbau Mehrteiliges dichtringsystem fuer hohe druckdifferenzen
US3971298A (en) * 1973-05-10 1976-07-27 Oswdek Badawczo-Rozwojowy Przemyslu Budowy Chemicznych Cebea Piston assembly with compression and guiding rings
US4326724A (en) * 1978-12-21 1982-04-27 Linde Aktiengesellschaft Piston and seal assembly
US4714008A (en) * 1985-11-21 1987-12-22 Bowers Walter B Piston for internal combustion engines and the like
US5071318A (en) * 1990-01-22 1991-12-10 Westinghouse Electric Corp. Reactor coolant pump having improved dynamic secondary seal assembly

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HUT59470A (en) * 1990-01-18 1992-05-28 Laszlo Wilheim Piston-ring unit for piston reciprocating machines particularly for internal combustion engines

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB284133A (en) * 1927-06-11 1928-01-26 William James Banks Improvements in metallic packing rings for pistons
US1779837A (en) * 1927-08-30 1930-10-28 Joseph F Batty Ring packing
US2294519A (en) * 1941-08-09 1942-09-01 Caterpillar Tractor Co Piston structure
CH232422A (de) * 1942-07-23 1944-05-31 Limited M E P Company Dichtungsring-Lagerung.
DE884586C (de) * 1943-06-29 1953-07-27 Maschf Augsburg Nuernberg Ag OElabstreifvorrichtung an Kolben von Brennkraftmaschinen
US2799523A (en) * 1954-05-06 1957-07-16 Linear Inc Pressure-actuated seals
US2948554A (en) * 1957-07-29 1960-08-09 Mahand Jack Rotary seal
US3023014A (en) * 1957-11-18 1962-02-27 Int Harvester Co Seal between relatively rotating members
US3353832A (en) * 1965-05-24 1967-11-21 Felt Products Mfg Co Sealing assembly
DE2361425A1 (de) * 1972-12-19 1974-06-20 Rudisleben Chemieanlagenbau Mehrteiliges dichtringsystem fuer hohe druckdifferenzen
GB1357090A (en) * 1973-03-14 1974-06-19 Foerenade Fabriksverken Sealing devices for limiting fluid leakages along piston rods or other elongated cylindrical elements
US3971298A (en) * 1973-05-10 1976-07-27 Oswdek Badawczo-Rozwojowy Przemyslu Budowy Chemicznych Cebea Piston assembly with compression and guiding rings
US4326724A (en) * 1978-12-21 1982-04-27 Linde Aktiengesellschaft Piston and seal assembly
US4714008A (en) * 1985-11-21 1987-12-22 Bowers Walter B Piston for internal combustion engines and the like
US5071318A (en) * 1990-01-22 1991-12-10 Westinghouse Electric Corp. Reactor coolant pump having improved dynamic secondary seal assembly

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1312419C (zh) * 2001-07-09 2007-04-25 伯克哈特压缩机股份公司 活塞环
US7121192B2 (en) 2003-03-21 2006-10-17 Dana Corporation Piston ring coating
US20040216606A1 (en) * 2003-03-21 2004-11-04 Smith Thomas J. Piston ring coating
US20050051970A1 (en) * 2003-09-10 2005-03-10 Wolfgang Edelmann Piston ring
AT413432B (de) * 2003-09-10 2006-02-15 Hoerbiger Kompressortech Hold Kolbenring
WO2005121608A1 (en) * 2004-06-08 2005-12-22 Savice Limited A piston, a ring and a piston assembly for a two cycle engine
US7455506B2 (en) * 2004-12-29 2008-11-25 Bendix Commercial Vehicle Systems Llc Injection moldable piston rings
US20070241297A1 (en) * 2006-04-13 2007-10-18 Honeywell International, Inc. Guided pneumatic second stage switching valve
US9138839B2 (en) 2009-12-14 2015-09-22 Hoerbiger Kompressortechnik Holding Gmbh Piston having position rings and support rings
US20130154197A1 (en) * 2010-08-31 2013-06-20 Norbert Feistel Seal arrangement
US8985588B2 (en) * 2010-08-31 2015-03-24 Burckhardt Compression Ag Seal arrangement
US20130233259A1 (en) * 2010-09-23 2013-09-12 Michael W. Courson Rotary cam radial steam engine
US9453411B2 (en) * 2010-09-23 2016-09-27 Michael W. Courson Rotary cam radial steam engine
US9856866B2 (en) 2011-01-28 2018-01-02 Wabtec Holding Corp. Oil-free air compressor for rail vehicles
DE102014114924A1 (de) * 2014-10-14 2016-04-14 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Kolben-Zylinder-Anordnung für einen ölfreien Verdichter zur Erzeugung von Druckluft
EP4227533A1 (de) * 2022-02-10 2023-08-16 Burckhardt Compression AG Kolben für einen verdichter, verdichter sowie verfahren und abziehwerkzeug zur demontage eines kolbens
WO2023152265A1 (de) * 2022-02-10 2023-08-17 Burckhardt Compression Ag Kolben für einen verdichter, verdichter sowie verfahren und abziehwerkzeug zur demontage eines kolbens
CN118328907A (zh) * 2024-06-14 2024-07-12 江苏省计量科学研究院(江苏省能源计量数据中心) 一种梯形活塞环梯形角的分段式测量系统及方法

Also Published As

Publication number Publication date
JP3285624B2 (ja) 2002-05-27
PL169681B1 (pl) 1996-08-30
ATE120521T1 (de) 1995-04-15
EP0541482B1 (de) 1995-03-29
EP0541482A1 (de) 1993-05-12
BR9204299A (pt) 1993-05-11
PL296366A1 (en) 1993-09-20
AU650798B2 (en) 1994-06-30
JPH05215072A (ja) 1993-08-24
CA2082205A1 (en) 1993-05-07
CZ331592A3 (en) 1993-05-12
DE59201774D1 (de) 1995-05-04
AU2815892A (en) 1993-05-13
ES2070618T3 (es) 1995-06-01
CZ289846B6 (cs) 2002-04-17
CA2082205C (en) 1998-12-08

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